The Dell Precision 7530 supports USB Power Delivery 2.0 fast charging up to 90W through both of its Thunderbolt 3 enabled Type-C ports. By connecting the Dell PC to the the Dell 45W Hybrid Adapter + Power Bank over the Type-C interface, we can see how charging happens through USB Power Delivery. Note the Dell 45W Hybrid Adapter + Power Bank was being connected to AC power throughout charging.
Using the GRL-USB-PD-C2 Compliance Test Solution App, we observed initial current being pulled by the Dell PC upon a 5 volts rail starting voltage. When the voltage ramped up quickly to a 20 volts rail, the PC pulled a quick current spike of about 2.7 amps resulting in a very brief 51.3 watts (19 volts @ 2.7 amps) charging. The current then immediately dropped down to about .1 amps to follow up with steady state charging of just around 1.98 watts (19.8 volts @ .1 amps). Even with 20V, the current was too low to enable any fast charging between the Dell Precision 7530 and the Dell 45W Hybrid Adapter + Power Bank. This could be due to the PC needing 90 watts but since the charger can only provide up to 45 watts, it is not the appropriate charger to use with this PC. Click here to download the trace captured by the Granite River Labs USB Power Delivery Compliance C2 Tester to view more details.